Remove .idea directory. Thanks for the heads-up @adamkus

.idea/.name

.idea/compiler.xml

.idea/copyright/profiles_settings.xml

.idea/encodings.xml

.idea/gradle.xml

.idea/libraries/answers_1_3_6.xml

.idea/libraries/appcompat_v7_21_0_3.xml

.idea/libraries/beta_1_1_4.xml

.idea/libraries/commons_lang3_3_4.xml

.idea/libraries/crashlytics_2_5_5.xml

.idea/libraries/crashlytics_core_2_3_8.xml

.idea/libraries/fabric_1_3_10.xml

.idea/libraries/logback_android_1_1_1_3.xml

.idea/libraries/mongo_java_driver_3_0_2.xml

.idea/libraries/physicaloidlibrary.xml

.idea/libraries/slf4j_api_1_7_2.xml

.idea/libraries/support_annotations_21_0_3.xml

.idea/libraries/support_v4_21_0_3.xml

.idea/misc.xml

.idea/modules.xml